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Proceedings Paper

Remote sensing albedo product validation over heterogenicity surface based on WSN: preliminary results and its uncertainty
Author(s): Xiaodan Wu; Jianguang Wen; Qing Xiao; Jingjing Peng; Qiang Liu; Baocheng Dou; Yong Tang; Xiuhong Li
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Paper Abstract

The evaluation of uncertainty in satellite-derived albedo products is critical to ensure their accuracy, stability and consistency for studying climate change. In this study, we assess the Moderate-resolution Imaging Spectroradiometer(MODIS) albedo 8 day standard product MOD43B3 using the ground-based albedometer measurement based on the wireless sensor network (WSN) technology. The experiment have been performed in Huailai, Hubei province. A 1.5 km*2 km area are selected as study region, which locates between 115.78° E-115.80° E and 40.35° N-40.37° N. This area is characterized by its distinct landscapes: bare ground between January and April, corn from May to Octorber. That is, this area is relatively homegeneous from January to Octorber, but in Novermber and December, the surface is very heterogeneous because of straw burning, as well as snow fall and snow melting. It is a big challenge to validate the MODIS albedo products because of the vast difference in spatial resolution between ground measurement and satellite measurement. Here, we use the HJ albedo products as the bridge that link the ground measurement with satellite data. Firstly, we analyses the spatial representativeness of the WSN site under green-up, dormant and snow covered situations to decide whether direct comparison between ground-based measurement and MODIS albedo can be made. The semivariogram is used here to describe the ground hetergeneity around the WSN site. In addition, the bias between the average albedo of the certain neighborhood centered at the WSN site and the center pixel albedo is also calculated.Then we compare the MOD43B3 value with the ground-based value. Result shows that MOD43B3 agree with in situ well during the growing season, however, there are relatively large difference between ground albedos and MCD43B3 albedos during dormant and snow-coverd periods.

Paper Details

Date Published: 21 November 2014
PDF: 7 pages
Proc. SPIE 9260, Land Surface Remote Sensing II, 92603P (21 November 2014); doi: 10.1117/12.2069113
Show Author Affiliations
Xiaodan Wu, Institute of Remote Sensing and Digital Earth (China)
Univ. of Chinese Academy of Sciences (China)
Jianguang Wen, Institute of Remote Sensing and Digital Earth (China)
Qing Xiao, Institute of Remote Sensing and Digital Earth (China)
Jingjing Peng, Institute of Remote Sensing and Digital Earth (China)
Univ. of Chinese Academy of Sciences (China)
Qiang Liu, Beijing Normal Univ. (China)
Baocheng Dou, Institute of Remote Sensing and Digital Earth (China)
Yong Tang, Institute of Remote Sensing and Digital Earth (China)
Xiuhong Li, Beijing Normal Univ. (China)


Published in SPIE Proceedings Vol. 9260:
Land Surface Remote Sensing II
Thomas J. Jackson; Jing Ming Chen; Peng Gong; Shunlin Liang, Editor(s)

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